<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF=8">
    <title>cass</title>
   <style>
       p{
           color:red;

       }
       div{
           font-size:30px;
       }
       .c1{
           color:blue;
       }
       .c2{
           color:green;
       }
   </style>
</head>
<body>
    <p>这里是正常字体的段落</p>
    <div>
        <p>这里是<span class="c1">蓝色</span>.这里是<span class="c2">绿色</span></p>
        <p>这里是<span class="c3">红色</span></p>
    </div>
    
</body>
</html>